I am indeed glad that you are ok. CO poisoning is nasty stuff. Regarding CO being produced by the incomplete burning of the tobacco, anything that burns will produce CO if it is organic. "Incomplete burning" or not. With hookah you should be avoiding an actual burning of the tobacco as much as possible. When you broil it with indirect heat some CO will be produced but the majority is going to come from the coals as it is prety much burning carbon. This is increased in the case of QL coals. Especially in the ambient levels in the house after lighting.